Self-opening closure for composite packagings or for container connection pieces closed by film material

ABSTRACT

The self-opener closure comprises a spout ( 2 ) having a projecting lower rim ( 9 ) which is to be molded or glued to a composite packaging, an associated rotary cap ( 1 ) as well as a self-opener sleeve ( 3 ) arranged within the spout ( 2 ). This self-opener sleeve ( 3 ) can be made to rotate by the rotary cap ( 1 ). The inner side of the spout ( 2 ) is provided with four guide webs having varying inclines arranged over its inner circumference. These interact with specially formed guide ribs at the outer wall of the self-opener sleeve ( 3 ), which brings about that the self-opener sleeve ( 3 ), when continuously rotated in the inside of the spout ( 2 ), and by being guided at these guide ribs, describes an uneven downwardly directed movement, which superposes its rotational movement. Thus, the self-opener sleeve ( 3 ) first pierces the paper or cardboard laminate with the tip ( 24 ) of its lancing mandrel in a steep, screwline downwardly directed movement, and thereafter completes a horizontal rotational movement about 340°, whilst it cuts a circular disk out of the laminate with its sharp cutting edge, and thereafter pivots this downwards and retains it in this position.

BACKGROUND OF THE INVENTION

The present invention relates to a self-opener closure for compositepackagings as well as to container spouts or bottle spouts of all typesto be closed with film material. At the same time one specificallyenvisages liquid packagings in the form of such composite packagings offilm-coated paper in which, for example, milk, fruit juices, all typesof non-alcoholic beverages or generally liquids also in the non-foodrange are packaged. The closure may however also be applied to compositepackagings in which goods capable of being poured such as sugar,semolina or all types of chemicals and likewise are kept or packaged.With this film-coated paper it is the case of a laminate material suchas a paper or cardboard web coated with plastic such as, for example,polyethylene and/or aluminium. Usually the volumes of such packagingsrange from 20 cl up to 2 liters and more. Alternatively the self-openerclosure may also be assembled on containers which are closed by filmmaterial, such as on all types of bottles made of glass or plastic or onsimilar containers. Such closures of plastic are known in variousembodiments. If they are envisaged for a composite packaging, theyessentially form a pour-out or discharge spout having a rim whichradially projects from its lower edge and which forms a closing flangeat this discharge spout. The spout is equipped with an outer thread ontowhich a rotary cap may be screwed as a closure. Such a self-openerclosure is flanged onto the composite packaging in that it is sealinglywelded onto the composite packaging with the lower side of itsprojecting edge, thus with the lower side of its flange. However, thefree passage at the lower end of the spout is thereafter closed by paperand sealing film of the composite packaging. In the case of a bottleclosure the pour-out spout for its part may be placed or screwed ontothe opening of the bottle, and on its inner side is closed with a filmmembrane. The spout is equipped with an outer thread onto which therotary cap may be screwed as a closure. To open, the film-reinforcedpaper passing through and below the welded-on spout, or the filmmembrane extending within the spout must be cut open or torn opentowards the opening or pressed away so that the passage may be clearedand the fluid or the pourable material may be poured or shaken out ofthe container through the spout. For this a sleeve or a nipple isarranged within the spout which, on rotating the screwed-on cap, iscaught by this and thus is rotated by this in the same direction ofrotation. By means of a thread counter-rotating to the thread on theouter side of the spout and on the outer side of the sleeve, this sleevemoves continuously in a downward direction on screwing off the rotarycap, that is to say when said sleeve is displaced upwards with respectto the liquid packaging. The lower rim of the sleeve is provided withone or more tearing or cutting teeth. In this way, and as a result ofits rotation and constant downwards movement, the sleeve is to press orcut a disk out of the film-reinforced paper or film membrane which runsbeneath it.

However, such conventional self-opener closures do not functionsatisfactorily. The disks are not cut cleanly from the paper film or thefilm membrane, but rather the sleeves simply press a piece of film outof this. The remaining edge is frayed and thus shreds of paper or filmproject into the passage which was supposed to be cleared. These shredsoften project downwards into the container and on pouring or shaking outpossibly block the path of the air flowing from outside into thecontainer, or the even project into the path of the outflowing jet ofliquid or the poured product. With larger packagings having strongerfilm-reinforced paper or cardboard the opening procedure is carried outeven less reliably and cleanly. The sleeve moving slowly downwards androtating at the same time, with its complete lower edge quasisimultaneously contacts the film-reinforced paper web which is to be cutopen and as a whole presses it downwards and rotates on it until a holeis scraped open or broken through rather than cleanly cut open. Oneproblem lies in the fact that the film to be cut open gives way slightlyto the pressure of the sleeve acting to a certain extent as a drill bit,and thus the sleeve no longer acts on a paper film which is plane but onone which is curved downwards. Furthermore, the previous solutionsdemand a significant force on the part of the user as a result of thedesign of the sleeves, which are aptly also called penetrators, becauseindeed they penetrate a piece of paper film rather than cleanly cuttinga circular disk out of it. That is to say, a large torque must beexerted since the teeth or tearers on the lower penetrator edge orsleeve edge firstly merely scratch the film and then they must overcomea large resistance to rotation. In the uppermost layer of the paperthickness they act similarly to tear-open teeth, specifically in ascraping, pressing and tearing manner, rather than acting as actualcutting blades. In order to facilitate the breaking out or tearing outfor conventional self-opener closures of this type, the film material orthe composite material is pre-weakened at the desired tear locations bymeans of lasers or punching tools. However, this pre-weakening entailsmuch technological effort. Expensive installations are required and thehandling for the machining of the penetration locations on the films istime-consuming. In spite of these elaborate weakening measures, theconventional self-opener closures do not cut cleanly, but tear the paperor plastic film rather than cleanly cutting it open, which explains thelarge resistance to rotation. On account of these large rotationresistances, even breakages of the means which should effect thetransmission of the torque from the threaded cap to the penetratorsleeve occur, or the catching cams provided to engage into grooves onthe penetrator sleeve can jump out of these grooves. If this happens,the self-opener closure is no longer capable of functioning.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to solve theseproblems and to provide a self-opener closure for composite packagingsor for container spouts sealed with film material, which reliablypermits to cut-out the laminate disk or film disk in various dimensionsin the clear spout passage and to obtain cleanly cut edges so thatshreds projecting into the passage are avoided. For a multitude of filmmaterials and composite materials it should even be possible to dispensewith the targeted pre-weakening of the cutting locations by punching orlaser treatment.

This object is achieved by a self-opener closure for compositepackagings as well as for container spouts closed with film material,consisting of a spout which may be sealingly fitted onto a compositepackaging or onto a container closed with film material, of anassociated rotary cap, as well as of a self-opener arranged within thespout and which self-opener may be brought into rotation by the rotarycap. The self-opener closure is characterised in that the inner side ofthe spout is provided with at least two guide webs being arranged aroundits inner circumference and having varying inclines, so that thesleeve-shaped self-opener, at whose outer side there are arranged atleast two guide ribs each having a guide surface, and when continuouslyrotating within the spout guiding its guide surfaces at the guide webs,initially follows a downwardly directed movement, along a steepscrew-path which hereafter goes over into a pure horizontal rotationalmovement.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

The Figures show various views of a preferred embodiment of thisself-opener closure for composite packagings. By means of these Figuresthe self-opener closure shall be described in detail and its functionshall be explained. There are shown in:

FIG. 1 the self-opener closure with its three components in a dismantledstate, in a side view;

FIG. 2 the self-opener closure with its three components in a dismantledstate, in a side view, whereby all components are shown in alongitudinal sectional view along the centerline of the closure;

FIG. 3 the self-opener closure with its three components in an assembledstate in a longitudinal sectional view along the centerline of theclosure;

FIG. 4 the self-opener closure in an assembled state in a perspectiveview as seen from below at an angle, whereby the self-opener sleeve isin its initial state;

FIG. 5 the self-opener closure in an assembled state in a perspectiveview as seen from below at an angle, whereby the self-opener sleeve isin an extended or lowered state ready for the cutting movement;

FIG. 6 the self-opener closure in an assembled state in a perspectiveview as seen from below at an angle, whereby the self-opener sleeve isshown to be completely removed from the spout; and

FIG. 7 the self-opener closure in an embodiment for assembling on acontainer closed with a film.

DETAILED DESCRIPTION OF THE DRAWING FIGURES

FIG. 1 shows the self-opener closure in a dismantled state. It consistsof three components made of injection moulded plastic, namely a rotarycap 1, a discharge spout 2 and a self-opener sleeve 3. The rotary cap 1is provided on its outer surface with knurls or grooves for ease ofhandling. A guarantee strip 4 is injection moulded to the lower edge ofthe rotary cap 1 and is connected to the rotary cap 1 only by thinmaterial bridges or bars 5 being designed as and arranged to bepredetermined breaking points. At its outer side the discharge spout 2is provided with an outer thread which fits to an equivalent innerthread on the rotary cap 1, whereby this is not visible here. Beneaththe outer thread 6 the spout 2 has a small, obliquely angled bead 7 withan angular or square-edged rim 8 on its lower side. Alternatively,instead of a discharge spout 2 having an outer thread and an appropriatethreaded cap having an inner thread, a discharge spout having anappropriate cap can be foreseen, whereby the rotary cap can be mountedonto the discharge spout by means of a bayonet coupling. For this, thespout is provided on its outer side with appropriate grooves and therotary cap is provided on its inner side with equivalent cams, or viceversa. The counter-clockwise rotation of the rotary cap, which is to becarried out initially in a horizontal plane, firstly activates theself-opener sleeve exactly in the same way as usually the threaded capis activated, which shall be more closely described hereinafter. Aradially projecting, annular and planar projection or brim 9 is formedat the lower edge or rim of the spout 2. With the lower surface of thisplanar projection, the spout 2 is sealingly welded onto a compositepackaging made of a laminate composed of a film-reinforced paper orcardboard web. Therefore, this laminate extends continuously beneath thedischarge spout 2 and, on its underside, seals the clear passage openingof the spout 2. In order to be able to pour liquid through this spoutout of the packaging, the laminate in the region of the passage openingmust be pressed away, perforated, cut away or tom away. It is desirableto uncover the passage opening as completely as possible, which meansthat the laminate in this area is cut away as cleanly as possible, afterwhich the cut laminate disk can be pivoted away, thus clearing thepassage as completely as possible. A self-opener in the form of aspecially formed sleeve 3 serves to uncover the passage opening. At thelower edge of this sleeve 3 there is provided at least one lancingmandrel 10 having a sharp tip 24, which, when viewed from above onto thesleeve 3, forms a sharp cutting edge 11 in a counterclockwise direction.At the outer circumference of the self-opener sleeve 3 there areprovided at least two guide ribs 12 distributed over the circumference,and preferably, as shown in the embodiment, four guide ribs areprovided. Each of these guide ribs 12 is composed of two sections 13,14, namely a section 13 extending horizontally at the sleeve 3 and avertical section 14, which together form a right angle. The outer tip ofthis right angle is bevelled at an angle of 45° to the sections 13, 14and this bevelled surface forms a guide surface 15, which is intended toglide along a guide curve formed of guide webs at the inner wall of thespout 2, as shall be more clearly shown in further Figures.

In FIG. 2 there is shown the self-opener closure also with its threecomponents, that is to say the rotary cap 1, the discharge spout 2 andthe self-opener sleeve 3 in a dismantled state. However, all componentsare shown in a longitudinal section along the centreline of the closure.Inside the rotary cap 1 the inner thread 16 can be seen. At the loweredge, the guarantee strip 4 is seen attached by several thin materialbridges or bars 5 serving as predetermined breaking points. As afeature, within this rotary cap 1 at the underside of the cap lid in theshown embodiment, there are formed two cylinder wall segments 17, 18,whereas the radius of the corresponding cylinder is smaller than that ofthe cylindrically shaped rotary cap wall. Both cylinder wall segments17, 18, which follow each other in the circumferential direction, arespaced from each other by a small lateral space, so that a slit 19 isformed between each of them. The lower edges of the two cylinder wallsegments 17, 18 are designed to slope downwards and thus each form alower edge leading downwardly directed in a screwline shape. At thedischarge spout 2 shown beneath the rotary cap 1, guide webs 20 arearranged in distribution over the inner circumferential wall of thespout 2, which guide webs are to cooperate or interact with the guideribs 12 of the self-opener sleeve 3. In the embodiment shown there arefour such guide webs 20; one is shown in full, the two on the left andthe right of the Figure are shown each in half, and the one arranged atthe portion of the spout 2 which has been cut away for this illustrationis not visible at all. Each of these guide webs 20 consists of ahorizontal section 21 and a section 22 which inclines or slants upwardstowards the axis of the spout. At the outer side of the spout 2 thegrooves of the outer thread 6 and the bead 7 can be seen, over which therotary cap 1, for assembling with its guarantee strip 4, can beirreversibly drawn or pushed. Because the upper side of the bead 7 isinclined, the guarantee strip 4 can be pushed down over this bead 7under slight deformation. In contrast, and because of the sharp edge orrim 8 at the lower side of the bead 7, the guarantee strip 4 cannot bepulled back upwards over the bead 7 once it has tightly enclosed thecircumferential wall of the spout 2 below this bead. Therefore, in orderto open the rotary cap 1, the guarantee strip 4 must be removed bytearing it away, thus rupturing the material bridges 5. This releasesthe rotary cap 1 to be turned and moved upwards. The projection 9projecting radially from the lower rim of the spout 2 is welded to thepaper laminate or cardboard laminate of a packaging for liquids or drygoods by means of ultrasonic welding. The self-opener sleeve 3 is shownbeneath the spout 2. The lower edge of the sleeve 3 tapers off in aguide mandrel 10, which, when viewed from above towards the side incounter-clockwise direction, forms a sharp cutting edge 11 and tapersoff at the end in a sharp tip 24. To the right of FIG. 2 one sees thehorizontally extending section 13 of an individual guide rib 12 at theouter wall of the sleeve 3. At the inner side close to the upper edge ofthe self-opener sleeve 3 a web or bridge 23 traverses the clear distanceof the sleeve 3. When the components of this self-opener closure areassembled, the self-opener sleeve 3 is arranged within the spout 2. Indoing so, the sleeve 3 is rotationally pushed into the spout 2 in such amanner that the guide ribs 12 of its bevelled guide surface 15 come torest at the underside of the upper end of the inclined or slantingsection 22 of the guide webs 20 at the spout 2. In turn, the rotary cap1 is mounted in such a rotational position onto these two componentsthat the traversing web 23 is arranged in the slits 19 between the twocylinder wall segments 17, 18 at the lower lid side of the rotary cap 1.Under slight deformation of its guarantee strip 4, the rotary cap 1 ispushed with force over the upper taper of the bead 7 and thus securesthe rotary cap 1 from twisting by subsequently closely fitting to theouter side of the spout wall, because it is retained in its lowest screwposition by the guarantee band 4 and can only be unscrewed if theguarantee band 4 is first tom away, because this can no longer glideover the sharp lower edge 8 of the bead 7.

FIG. 3 shows the self-opener closure with its three components in anassembled state in a longitudinal section along the centreline of theclosure. One sees that the self-opener closure 3 lies between thecylinder wall segments 17, 18 and the spout 2, and that the traversingweb 23 extends at the upper edge of the sleeve 3 in the slit 19 betweenthe neighbouring cylinder wall segments 17, 18. At the outer side of thesleeve 3 one sees the horizontal section 13 of one of its guide ribs 12.On the inner side of the spout 2 one sees the horizontal sections 21 ofthe guide webs 20, and at the outer side of the spout 2 the ribs of theouter thread 6 and, a little further down, the bead 7 over which theguarantee band 4 is pushed, as well as the radial projection 9 at thelower edge or rim of the spout 2. At the inner side of the rotary cap Iits inner thread 16 can be seen, and at the lower edge of the rotary cap1 the guarantee band 4 connected by fine material bridges 5. In thisembodiment, the self-opener closure 3 is in its initial state, thatmeans it is completely drawn back into the rotary cap 1.

There now follows a description of how the components 1, 2 and 3 of thisself-opener closure interact when opening the closure and therebycutting open the paper or cardboard laminate which is welded onto thespout 2. Firstly, the guarantee band 4 is torn away. This releases therotary cap 1 for unscrewing in that it can move upwards along the spout2. The lateral limiting surfaces of the cylinder wall segments 17 and 18now act upon the traversing web 23 at the self-opener closure, thatmeans they entrain it and thus cause it to rotate in the direction ofunscrewing the rotary cap 1 when viewed from above, that means in acounter-clockwise direction. In an alternative embodiment, instead of asingle traversing web there can be provided a star-shaped web havingthree arms or webs distributed radially around the circumference fromthe center of the sleeve 3 and projecting outwards; in this case,suitable cylinder wall segments must be foreseen, between which thethree webs come to lie. Also four radial webs which together form across made of two webs traversing the sleeve diameter are possible,whereas then four cylinder wall segments are distributed around thecircumference. When the sleeve 3 now is brought into rotation in acounter-clockwise direction via its web 23, then the guide surfaces 15of its guide ribs 12, as seen in FIGS. 1 and 2 but not visible here,glide along the underside of the guide webs 20 in a downward directionat the spout 2. Rotation of the rotary cap I to the left is thusaccompanied by a steep, screwline downwardly directed movement of theself-opener closure 3. As a result of this steep downward movement, thepaper or cardboard laminate which extends over the clear breadth of thespout 2 is initially essentially perforated or pierced by the sharp tip24 of the lancing mandrel at the lower edge of the sleeve 3. Thus, onlya hole is pierced into the edge of the laminate disk, that means thatthe laminate is pierced and not cut. Seen microscopically, when piercedthe laminate material is displaced to all sides and is torn at thepiercing point. The reaction forces of the piercing movement are broughtabout via the welding by the projecting brim 9 of the spout 2. Thisfirst movement step of the self-opener closure is decisive. Due to thefact that in conventional solutions the self-opener sleeve continuouslyrotates downwardly directed in a screwline and its teeth thus impingeupon the film at a flat angle, they are not able to pierce the film.However, with the present solution, in a first phase the sleeveexperiences a very steep downwardly directed movement. The sharp tip 24of its lancing mandrel 10 thus impinges on the film at a steep angle andpierces it initially virtually locally. By the time the paper orcardboard or plastic film has been pierced, the sleeve 3 has reached itslowest position in relation to the spout 2, that means that the guidesurface 15 at its guide ribs 12 is now positioned at the end of theinclined guide webs 22 at the inner wall of the spout, or at thebeginning of the horizontal sections 21 of the guide webs. If the rotarycap 1 is further turned in a counter-clockwise direction, then also thesleeve 3 is turned further in a counter-clockwise direction but nolonger moves downwards, but rotates in a horizontal plane. Now thelancing mandrel 10 protruding through the paper or cardboard film actsas a knife with its sharp cutting edge 11. Thus the cutting edge 11 cutsout a circular disk out of the paper or cardboard laminate along thelower inner edge of the spout 2. The cutting movements extend over onerotation of the sleeve of about 340°. At the finish of the cuttingrotation, the cut out disk is suspended merely by a thin material bridgeand, by means of the pressure force of the cutting edge 11 acting in thecutting direction, is pivoted or is folded downwards into the packagingand is retained in this downwardly pivoted position. Thus, in principle,this self-opener closure functions like a classic can opener. Also whenopening a can it is decisive that the lid is first pierced by anessentially vertical movement of the tip of the cutting tool upon andthrough the can lid. Only when the can lid has been pierced by the tipof the cutting tool does there follow a separate, now horizontallydirected cutting movement of the culling tool. The present self-openerclosure achieves precisely this can-opener effect, in that the sleevemoves first of all steeply downwards and in a first phase merely piercesthe film with the tip 24 of the lancing mandrel 10, and thereafter in asecond phase, the lancing mandrel 10 with its cutting edge 11 acts as acutting tool in that the sleeve is rotated horizontally. Therefore, anessential feature is that the movement of the sleeve is discontinous orerratic. After a steep downwardly directed movement for piercing thefilm there follows a discontinuous point and then a horizontalrotational movement for cutting. Piercing and cutting are distinctlydifferent, such as in opening a metal can with a can opener. At thelower edge of the inner side of the spout 2 there is a recess 25 whichis bordered or framed by ramps 26. During the end phase of therotational movement of the sleeve 3, a horizontal section 21 enables oneof its guide ribs 2 to glide over the ramp 26 and engage into thisrecess 25. Thereafter the sleeve 3 can be neither rotated furtherforwards nor backwards, so that after cutting out and pivoting away ofthe laminate disk, the sleeve is held in this position. In this mannerthe laminate disk which has been almost totally cut away is reliablyretained pivoted downwards in the liquid packaging. Until the entirecutting movement, that is the rotation of the sleeve 3 about 340° afterpiercing of the paper or cardboard laminate, has been completed, therotary cap 1 at the spout 2 is screwed upwards for such a distance thatthe cylinder wall segments 17, 18 projecting downwards at the undersideof the rotary cap lid are lifted over the web 23 at the sleeve 3 andthus cannot transmit any torque to the web 23. Thereafter, the rotarycap 1 is completely unscrewed from the spout 2 and the liquid can nowexit the liquid packaging via the uncovered spout 2 or, in the case ofdry goods, can be poured out through the spout 2. Now the rotary cap 1can again be screwed onto the spout 2 to re-seal the closure. When therotary cap 1 is again screwed on to close the closure, the screwlineshaped, downwards extending lower edges of the cylinder wall segments17, 18 effect that no torque in a clockwise direction is transmitted tothe web 23, in that these screwline shaped lower edges merely glide overthe upper side of the traversing web 23, but can no longer entrain it.

FIGS. 4 and 5 illustrate the mode of operation of this self-openerclosure particularly well. FIG. 4 shows the self-opener closure in anassembled state in a perspective view as seen from below at an angle.The self-opener closure 3 is in its initial state. At its upper edge onesees a portion of the traversing web 23 which connects its upper edge attwo points. This web 23 lies between the two cylinder wall segments 17,18 which are moulded to the underside of the lid of the rotary cap 1.When the rotary cap 1 is rotated in a loosening direction, in this caseas seen from below in a clockwise direction, then the cylinder wallsegments 17, 18 entrain the web 23 lying there between and thus also thesleeve 3, and, due to the special guide ribs 12 at its outer side andthe guide webs 20 at the inner side of the spout, compelling the sleeveto be moved in a downward direction in a steep spiral. In doing so, thesharp tip 24 of the lancing mandrel 10 acts as a piercing tip and firstpierces the paper or cardboard laminate welded onto the underside of theprojecting brim 9 of the spout 2 of the composite packaging.

In FIG. 5 there is shown the self-opener closure with the self-openersleeve in an extended or completely lowered state. Having reached thisposition, the sleeve 3 may rotate further only in a horizontal plane,whereby the lancing mandrel 10 now acts as a knife, because its edge,here seen from below and oriented in a clockwise direction, is formed asa sharp cutting edge 11. When the rotary cap 1 is further rotated by340°, this cutting edge moves along the lower inner edge of the spout 2,thereby cutting a circular disk out of the paper or cardboard laminatewhich is welded to the underside of the projection 9, but is not shownhere. As soon as the sleeve 3 has completed a rotation about 340° afterhaving pierced the paper laminate, the end of one of the horizontalsections 13 of its guide ribs 12 engages in the recess 25 at the innerwall of the spout 2 and prevents the sleeve 3 from being able to berotated further forwards or reversely. In this position the sleeve 3 hasalmost completely pivoted the disk which was cut away from the laminatedownwards into the container and securely retains it in this position.The discharge through the spout 2 is thus enabled.

FIG. 6 shows the discharge spout 2 and the sleeve 3 of the self-openerclosure in an assembled state in a perspective view as seen from belowat an angle, whereby the self-opener sleeve 3 is shown to be completelydisengaged from the spout 2, so that the special arrangement of itsguide ribs 12 can be seen more clearly and thus its function can bebetter understood.

FIG. 7 shows an alternative embodiment of this self-opener closure forassembling on a membrane sealed neck of a container or a bottle.Therefore, the discharge spout 2 is not provided with a projecting rimat its underside, but is arranged over a shoulder 27 in a thread sleeve28, which can be screwed on to the outer thread of a bottleneck or tothe discharge spout of any type of container which is closed or sealedat its upper rim with a film.

1. A self-opener closure for composite packagings for container spoutswith a film material, comprising: a spout mounted on a compositepackaging or on a container spout sealed with a film material, saidspout having an inner side with at least two guide webs around its innercircumference and having varying inclines; a rotary cap having an innerside with at least two detached cylinder wall segments spaced apart fromone another in a circumferential direction; and, a self-opener having asleeve-shape with said rotary cap and said self-opener being arrangedwithin said spout and being rotatable via said rotary cap, saidself-opener having an outer side with at least two guide ribs on saidouter side with each guide rib of said at least two guide ribs of saidself-opener having a guide surface, so that when said self-openerrotates within said spout, said guide surface of said self-opener isguided by said at least two guide webs of said spout, thereby rotatingsaid spout in a downwardly-directed movement along a screw-path, saidself-opener further comprising at an inner side of an upper edge atleast one web extending radially from a sleeve axis and traversing adiameter of said self-opener, said at least one web fitting betweenspaces of said at least two detached cylinder wall segments and walls ofsaid spout, with said at least two guide ribs of said self-opener beingarranged in distribution over a circumference of said outer side of saidself-opener, said least two guide ribs cooperating with said at leasttwo guide webs at said inner side of said spout in distribution over acircumference of said inner side of said spout, so that when said rotarycap rotates, torque of said rotary cap transmits over lateral limitingedges of said cylinder wall segments to a traversing web and to saidself-opener, said at least two guide ribs being formed so that, whenrotated, said self-opener initially follows a steep downwardly-directedscrewline movement and subsequently assumes a purely rotational movementin a horizontal plane.
 2. A self-opener closure for composite packagingsfor container spouts with a film material according to claim 1, whereinsaid self-opener comprises, at its lower edge, at least one lancingmandrel having a sharp, downwardly projecting tip and comprising a sharpedge at its flank showing in a counter-clockwise circumferentialdirection when viewed from above.
 3. A self-opener closure for compositepackagings for container spouts with a film material according to claim1, wherein lower edges of said at least two detached cylinder wallsegments each form a curved sloping in an axial direction relative to acylinder of said three free-standing cylinder wall segments.
 4. Aself-opener closure for composite packagings for container spouts with afilm material according to claim 1, wherein said at least two guide ribsof said self-opener at an outer wall of said self-opener are eachcomprised of a horizontal section and an adjoining vertical section, sothat a tip of a right angle formed by said horizontal section and saidadjoining vertical section is bevelled at an angle of 45° relative to anouter side of legs of said right angle, for forming a guide surface, andwith said at least two guide webs of said spout each being comprised ofa section extending with a constant inclination at a circumferentialwall and an adjoining horizontal section.
 5. A self-opener closure forcomposite packagings for container spouts with a film material accordingto claim 1, wherein said spout has a recess at a lower inner edge forreceiving one guide rib of said self-opener of said at least two guideribs in an end position of its rotational movement.
 6. A self-openerclosure for composite packagings for container spouts with a filmmaterial according to claim 1, wherein said at least two guide ribs ofsaid self-opener comprises three continuous guide ribs distributed overa circumference of said self-opener, said three continuous guide ribsinteracting with three guide webs of said at least two guide webs ofsaid spout distributed over a circumference of said spout, so that whensaid rotary cap rotates, torque of said rotary cap transmits overlateral limiting edges of cylinder wall segments to a traversing web andto said self-opener with said three guide webs of said self-opener andsaid spout being formed, so that when rotated, said self-openerinitially follows a steep downwardly-directed screw-line andsubsequently assumes a purely rotational movement in a horizontal plane.7. A self-opener closure for composite packagings for container spoutswith a film material according to claim 1, wherein said at least twoguide ribs of said self-opener comprises four continuous guide ribsdistributed over a circumference of said self-opener, said fourcontinuous guide ribs interacting with four guide webs of said at leasttwo guide webs of said spout distributed over a circumference of saidspout, so that when said rotary cap rotates, torque of said rotary captransmits over lateral limiting edges of cylinder wall segments to atraversing web and to said self-opener with said four guide webs of saidself-opener and said spout being formed, so that when rotated, saidself-opener initially follows a steep downwardly-directed screwline andsubsequently assumes a purely rotational movement in a horizontal plane.8. A self-opener closure for composite packagings for container spoutswith a film material according to claim 1, wherein said spout is athreaded spout and said rotary cap is a threaded rotary cap with a lowerregion of said threaded spout having a bead obliquely angled at an upperside thereof and at a lower side forms an angular rim, said threadedrotary cap having at a lower edge a guarantee strip molded thereto bymaterial bridges having predetermined breaking points pushable over saidbead.
 9. A self-opener closure for composite packagings for containerspouts with a film material according to claim 1, wherein said spout andsaid rotary cap form a bayonet coupling with a lower region of saidspout having a bead obliquely angled at an upper side thereof and at alower side forms an angular rim, said rotary cap having at a lower edgea guarantee strip molded thereto by material bridges havingpredetermined breaking points pushable over said bead.
 10. A self-openerclosure for composite packagings for container spouts with a filmmaterial, comprising: a spout mounted on a composite packaging or on acontainer spout sealed with a film material, said spout having an innerside with at least two guide webs around its inner circumference andhaving varying inclines; a rotary cap having an inner side comprisingtwo detached cylinder wall segments spaced apart from one another in acircumferential direction; and, a self-opener having a sleeve-shape withsaid rotary cap and said self-opener being arranged within said spoutand being rotatable via said rotary cap, said self-opener having anouter side with at least two guide ribs on said outer side with eachguide rib of said at least two guide ribs of said self-opener having aguide surface, so that when said self-opener rotates within said spout,said guide surface of said self-opener is guided by said at least twoguide webs of said spout, thereby rotating said spout in adownwardly-directed movement along a screw-path, said self-opener havingan inner side comprising at least one traversing web at an upper edge ofsaid self-opener, said at least one traversing web fitting betweenspaces of said two detached cylinder wall segments at said rotary cap,with a wall of said self-opener being between said two detached cylinderwall segments and walls of said spout, said outer side of saidself-opener comprising said at least two guide ribs arranged indistribution over a circumference of said self-opener, said at least twoguide ribs interacting with said at least two guide webs arranged onsaid inner side of said spout in distribution over a circumference ofsaid inner side of said spout, so that when said rotary cap rotates,torque from said rotary cap transmits over lateral limiting edges ofsaid two detached cylinder walls to said traversing web and to saidself-opener with said at least two guide webs and said spout beingformed so that, when rotated, said self-opener initially follows a steepdownwardly-directed screw-line and subsequently assumes a purelyrotational movement in a horizontal plane.
 11. A self-opener closure forcomposite packagings for container spouts with a film material accordingto claim 10, wherein lower edges of said two detached cylinder wallsegments each form a curved sloping in an axial direction relative to acylinder of said three free-standing cylinder wall segments.
 12. Aself-opener closure for composite packagings for container spouts with afilm material according to claim 10, wherein said self-opener comprises,at its lower edge, at least one lancing mandrel having a sharp,downwardly projecting tip and comprising a sharp edge at its flankshowing in a counter-clockwise circumferential direction when viewedfrom above.
 13. A self-opener closure for composite packagings forcontainer spouts with a film material according to claim 10, whereinlower edges of said at least two detached cylinder wall segments eachform a curved sloping in an axial direction relative to a cylinder ofsaid three free-standing cylinder wall segments.
 14. A self-openerclosure for composite packagings for container spouts with a filmmaterial according to claim 10, wherein said at least two guide ribs ofsaid self-opener at an outer wall of said self-opener are each comprisedof a horizontal section and an adjoining vertical section, so that a tipof a right angle formed by said horizontal section and said adjoiningvertical section is bevelled at an angle of 45° relative to an outerside of legs of said right angle, for forming a guide surface, and withsaid at least two guide webs of said spout each being comprised of asection extending with a constant inclination at a circumferential walland an adjoining horizontal section.
 15. A self-opener closure forcomposite packagings for container spouts with a film material,comprising: a spout mounted on a composite packaging or on a containerspout sealed with a film material, said spout having an inner side withat least two guide webs around its inner circumference and havingvarying inclines; a rotary cap having a cap lid with three free-standingcylinder wall segments at an inner side of said cap lid, said threefree-standing cylinder walls being spaced apart from one another in acircumferential direction; and, a self-opener having a sleeve-shape withsaid rotary cap and said self-opener being arranged within said spoutand being rotatable via said rotary cap, said self-opener having anouter side with at least two guide ribs on said outer side with eachguide rib of said at least two guide ribs of said self-opener having aguide surface, so that when said self-opener rotates within said spout,said guide surface of said self-opener is guided by said at least twoguide webs of said spout, thereby rotating said spout in adownwardly-directed movement along a screw-path, said self-opener havingat an upper edge of an inner side, a star-shaped web having three websextending radially from a sleeve axis of said self-opener and fittingbetween spaces of said three free-standing cylinder walls, with a sleevewall of said self-opener being arranged between said three free-standingcylinder wall segments and a wall of said spout, said outer side of saidself-opener comprising said at least two guide ribs arranged indistribution over a circumference of said self-opener, said at least twoguide ribs interacting with said at least two guide webs arranged onsaid inner side of said spout in distribution over a circumference ofsaid inner side of said spout, so that when said rotary cap rotates,torque from said rotary cap transmits over lateral limiting edges ofsaid three free-standing cylinder wall segments to said traversing weband to said self-opener with said at least two guide webs and said spoutbeing formed so that, when rotated, said self-opener initially follows asteep downwardly-directed screwline and subsequently assumes a purelyrotational movement in a horizontal plane.
 16. A self-opener closure forcomposite packagings for container spouts with a film material accordingto claim 15, wherein lower edges of said three free-standing cylinderwall segments each form a curved sloping in an axial direction relativeto a cylinder of said three free-standing cylinder wall segments.
 17. Aself-opener closure for composite packagings for container spouts with afilm material according to claim 15, wherein lower edges of said twodetached cylinder wall segments each form a curved sloping in an axialdirection relative to a cylinder of said three free-standing cylinderwall segments.
 18. A self-opener closure for composite packagings forcontainer spouts with a film material according to claim 15, whereinsaid self-opener comprises, at its lower edge, at least one lancingmandrel having a sharp, downwardly projecting tip and comprising a sharpedge at its flank showing in a counter-clockwise circumferentialdirection when viewed from above.
 19. A self-opener closure forcomposite packagings for container spouts with a film material accordingto claim 15, wherein lower edges of said at least two detached cylinderwall segments each form a curved sloping in an axial direction relativeto a cylinder of said three free-standing cylinder wall segments.
 20. Aself-opener closure for composite packagings for container spouts with afilm material according to claim 15, wherein said at least two guideribs of said self-opener at an outer wall of said self-opener are eachcomprised of a horizontal section and an adjoining vertical section, sothat a tip of a right angle formed by said horizontal section and saidadjoining vertical section is bevelled at an angle of 45° relative to anouter side of legs of said right angle, for forming a guide surface, andwith said at least two guide webs of said spout each being comprised ofa section extending with a constant inclination at a circumferentialwall and an adjoining horizontal section.